Sandy MacRae suggests: If examinations demand this type of labelling, textbooks will obviously use it and it is appropriate for histograms with variable bin size or vanishingly narrow bin size. But does anyone else use it when reporting data?
However, I had commented to him off-list that I would regard the label "frequency density" as an oxymoron. In terms of usage, Stata histogram command offers options:
" density, fraction, frequency, and percent specify whether you want the histogram scaled to density
units, fractional units, frequencies, or percentages. density is the default."
The distinction I would draw is that density units imply the sum of column areas is normalized as 1, while frequency units imply the sum is the number of observations.
Who examines the examiners?
Allan
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